Enhancing the magnetic and antibacterial properties of ZnO nanopowders through Mn+Co doping

Karthika, K.; Ravichandran, K.

doi:10.1016/j.ceramint.2015.02.135

Cited by 42 publications

(6 citation statements)

References 40 publications

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“…Morteza Zargar Shoushtari et al [58] observed the dia magnetic nature of ZnO when the size of the particles is in the range of 7.5 μm and when the size reaches 0.2 μm, the same samples have shown the paramagnetic nature, and surprisingly, the particles size reaches 36 nm and the samples possess the room-temperature FM in nature. In addition, some others observed the room-temperature FM nature of ZnO nanostructure with dopant substitution, [59,60] this kind of contradiction results mainly arises due to the defects and the exchange interactions in the ZnO. The researchers explained the diamagnetic nature of ZnO based on lattice distortion and size effect [61] and the origin of room-temperature FM of ZnO and doped ZnO system is based on the intrinsic defects such as zinc vacancies [62,63] and oxygen vacancies, [64,65] etc.…”

Section: Size-strain Plot Methodsmentioning

confidence: 99%

Influence of Metal (Al, Mg, Sm, and Cu) Dopants on Structural, Optical, Magnetic, and Antimicrobial Properties of ZnO Nanopowders Synthesized by Coprecipitation Method

Sowmya,

Aparna,

Chendra Prakash

et al. 2023

Physica Status Solidi (a)

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Pure and metal‐doped ZnO nanopowders with composition formula M0.04Zn0.96O (where M=Al, Mg, Sm and Cu) have been synthesized using the co‐precipitation method. The structural characterization of the synthesized powders was investigated using X‐ray diffraction (XRD) and the results confirm the hexagonal wurtzite structure without any additional phases. The change in structural parameters of ZnO with dopants was estimated using X‐ray peak profile analysis. The structural characterization was further analyzed by Fourier transform infrared spectroscopy (FTIR). The size and morphology of the synthesized powders were analyzed by a field emission scanning electron microscope (FE‐SEM), which also evidences the formation of uniform nanostructures with quasi‐spherical and hexagonal shapes. Moreover, the elemental composition of these metal‐doped nanostructures is determined by EDX measurements. UV‐Vis. spectroscopy is used to determine the energy band gap of ZnO by adding metal ion dopants. A vibration sample magnetometer (VSM) was employed to measure the samples’ magnetic properties, and dopants were found to induce distinct magnetic behaviors in ZnO. The antimicrobial activity of the synthesized powders was measured using the well diffusion method. It was observed that the introduction of dopant metals led to increased microbial activity. Among the doped ZnO variants, Al‐doped ZnO exhibited the highest level of microbial activity compared to pure ZnO and other samples.This article is protected by copyright. All rights reserved.

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Section: Size-strain Plot Methodsmentioning

confidence: 99%

Influence of Metal (Al, Mg, Sm, and Cu) Dopants on Structural, Optical, Magnetic, and Antimicrobial Properties of ZnO Nanopowders Synthesized by Coprecipitation Method

Sowmya,

Aparna,

Chendra Prakash

et al. 2023

Physica Status Solidi (a)

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“…The crystallite size (D) and the lattice parameters 'a' and 'c' are calculated using the formulae [25] D= (1) where 'λ' is the wavelength of the x-ray used, 'β' is the full-width at half-maximum (FWHM) and 'θ' is the Bragg's angle. [3] and ( )…”

Section: Evaluation Of Antibacterial Activitymentioning

confidence: 98%

“…The micro strain (ε) along the c-axis is calculated using the formula [3] ε = c -c 0 / c 0 (5) where c and c o are the calculated and standard lattice constant values, respectively. From Table.1 it is observed that the crystallite size decreases gradually from 63 to 28 nm as the Fe doping concentration increases from 1 to 10 at.…”

Section: Evaluation Of Antibacterial Activitymentioning

confidence: 99%

Tuning the magnetic behavior and improving the antibacterial efficiency of ZnO nanopowders through Zr+Fe doping for biomedical applications

Pushpa

Ravichandran

Ravichandran³

et al. 2015

Ceramics International

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“…The intensity of this preferential orientation decreases as the yttrium doping level increases which may be due to the deterioration of crystallinity [31]. This reduction in intensity may be due to the possible movement of zinc atoms into interstitial sites from the regular zinc locations caused by the substitution of yttrium ions [32]. Scherrer's formula was applied for calculating the crystallite size (D),…”

Section: Sensing Studymentioning

confidence: 99%

Enhanced Ammonia Sensing By Cost-Effective ZnO Thin Films Through Yttrium Doping

Ravichandran¹,

Aj²,

et al. 2021

Preprint

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Yttrium (Y) doped (doping concentration - 0, 1, 3 and 5 wt%) ZnO thin films were deposited using spray pyrolysis technique. The structural, surface morphological, optical and compositional properties were analysed using X-Ray diffraction (XRD), Atomic Force Microscopy (AFM), UV-vis NIR spectrophotmetry (UV), photoluminescence study (PL) and elemental composition analysis. Ammonia vapour sensing properties such as response/recovery, stability and repeatability were studied at room temperature. XRD results confirmed that the prepared samples have hexagonal wurtzite structure. ZnO:Y thin film with 5 wt% yttrium doping exhibits excellent sensing response of 99, fast response/recovery times of 29 s/ 7 s which may be due to the existence of oxygen vacancies in the case of ZnO:Y (5 wt%) film sample confirmed by photoluminescence (PL) study. These oxygen vacancies attract more electrons and thus enhance the gas sensing. In addition, increase in the number of active sites caused by the substitution of Y3+(trivalent) ions into the Zn2+ (divalent) regular sites as confirmed by the observed M-B (Moss-Burstein) effect also causes an enhancement in the gas sensing. Surface roughness, another reason for the enhanced sensitivity, has been confirmed by AFM.

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Enhancing the magnetic and antibacterial properties of ZnO nanopowders through Mn+Co doping

Cited by 42 publications

References 40 publications

Influence of Metal (Al, Mg, Sm, and Cu) Dopants on Structural, Optical, Magnetic, and Antimicrobial Properties of ZnO Nanopowders Synthesized by Coprecipitation Method

Influence of Metal (Al, Mg, Sm, and Cu) Dopants on Structural, Optical, Magnetic, and Antimicrobial Properties of ZnO Nanopowders Synthesized by Coprecipitation Method

Tuning the magnetic behavior and improving the antibacterial efficiency of ZnO nanopowders through Zr+Fe doping for biomedical applications

Enhanced Ammonia Sensing By Cost-Effective ZnO Thin Films Through Yttrium Doping

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